IT-602 Wireless and Mobile Computing - May 2023 Question Paper

Under each question, How to answer lists the points an answer should cover, outlined by CampusPrep from the syllabus. Check the details against your textbook.

1. 7 Marks
   aExplain how priority based multiple access schemes can be implemented?
   How to answer

   • Define priority-based multiple access and need for QoS differentiation
   • Explain priority mechanisms - access priorities, backoff, IFS, reservation
   • Steps for implementation - classification, queuing, scheduling, channel access
2. 7 Marks
   bWith neat sketch, explain the operation of helical antenna.
   How to answer

   • Define helical antenna structure and types
   • Describe construction with neat sketch labels
   • Explain operation - radiation modes axial/normal and applications
3. 7 Marks
   aExplain the architecture of GPRS in detail.
   How to answer

   • Define GPRS and its role in GSM evolution
   • Explain architecture components - SGSN, GGSN, PCU, interfaces
   • Explain protocol/data flow with diagram
4. 7 Marks
   bDescribe the handover and services available in GSM.
   How to answer

   • Define handover in GSM and its types
   • Describe handover procedure steps
   • List GSM services - teleservices, bearer, supplementary
5. 7 Marks
   aWhy do we need wireless LAN explain architecture of 802.11 LAN?
   How to answer

   • State need for wireless LAN - mobility, flexibility, installation
   • Describe 802.11 architecture - STA, AP, BSS, ESS, DS
   • Explain infrastructure and ad-hoc modes with diagram
6. 7 Marks
   bWhich waves are used in wireless LAN communication and why?
   How to answer

   • Identify waves used - radio, microwave, infrared
   • Explain properties - propagation, penetration, licensing
   • Justify why for WLAN - coverage, data rate, cost
7. 7 Marks
   aWhat are the four different versions of HIPERLAN explain with neat sketches?
   How to answer

   • Define HIPERLAN and its purpose
   • List four versions HIPERLAN-1/2/3/4
   • Explain each with neat sketches and applications
8. 7 Marks
   bWhat are the three channel accesses in HIPERLAN-1?
   How to answer

   • Define channel access in HIPERLAN-1
   • List three accesses - EY-NPMA priority, etc.
   • Explain working of each access phase
9. 7 Marks
   aList out the different challenges of password management.
   How to answer

   • Define password management
   • List challenges - guessing, reuse, storage, usability
   • Explain impact of each challenge
10. 7 Marks
    bWhat are the different methods of password management?
    How to answer

    • Define password management methods
    • Explain methods - hashing, salting, policies, MFA, managers
    • Compare suitability for mobile environment
11. 7 Marks
    aCompare the classical approaches to make the TCP suitable for mobile environment. Give their relative advantages and disadvantages.
    How to answer

    • List classical TCP improvements - Indirect, Snooping, Mobile TCP
    • Compare mechanism of each approach
    • Give relative advantages and disadvantages in table
12. 7 Marks
    bWith the help of a neat diagram, explain the reference model of wireless and mobile networks.
    How to answer

    • Define reference model for wireless/mobile networks
    • Present neat diagram with layers/entities
    • Explain function of each layer/component
13. 7 Marks
    aExplain about dynamic source routing protocol.
    How to answer

    • Define DSR and its on-demand nature
    • Explain route discovery and route maintenance phases
    • Discuss advantages, header and applications in MANET
14. 7 Marks
    bExplain the header fields of IP-in-IP, minimal, generic routing encapsulation.
    How to answer

    • Define encapsulation need in Mobile IP
    • Describe IP-in-IP, minimal and generic routing encapsulation headers
    • Explain header fields and comparison
15. 14 Marks
    Write short notes on the following:

    1. i)Dynamic Host Configuration Protocol (DHCP)
    2. ii)MAC layer
    How to answer

    • DHCP: definition, purpose, DORA process, role in mobility
    • MAC layer: definition, functions, 802.11 MAC techniques
    • Diagrams for DHCP lease and MAC sublayer